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EP0876561B1 - Mechanical gearing - Google Patents

Mechanical gearing Download PDF

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Publication number
EP0876561B1
EP0876561B1 EP97913538A EP97913538A EP0876561B1 EP 0876561 B1 EP0876561 B1 EP 0876561B1 EP 97913538 A EP97913538 A EP 97913538A EP 97913538 A EP97913538 A EP 97913538A EP 0876561 B1 EP0876561 B1 EP 0876561B1
Authority
EP
European Patent Office
Prior art keywords
wheel
shaft
frame
mechanical transmission
friction wheels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97913538A
Other languages
German (de)
French (fr)
Other versions
EP0876561A1 (en
Inventor
Heerke Hoogenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0876561A1 publication Critical patent/EP0876561A1/en
Application granted granted Critical
Publication of EP0876561B1 publication Critical patent/EP0876561B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
    • F16H15/50—Gearings providing a continuous range of gear ratios
    • F16H15/54—Gearings providing a continuous range of gear ratios in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first-mentioned members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/16—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface
    • F16H15/24—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface internally

Definitions

  • the invention relates to a mechanical transmission comprising a frame, a first shaft which is rotatably connected to the frame and to which is fixed a pair of friction wheels placed at a mutual distance, a second shaft which is connected to the frame for rotation parallel to the first shaft and which carries a wheel which co-acts with an annular element comprising a circular contact surface located axially between the friction wheels of the first shaft, wherein the friction wheels comprise mutually converging friction surfaces.
  • the present invention has for its object to provide improvements and additions to a construction of the type described in the preamble.
  • the invention provides for this purpose a transmission of the type stated in the preamble wherein the the transmission comprises guide means for realizing a rotational translating movement of the wheel which is connected to the second shaft, which guide means are assembled from at least two linear guide tracks received mutually perpendicularly in a plate and guide elements co-acting with the linear guide tracks, wherein guide elements are connected to the wheel for rotational translation and guide elements are rigidly connected to the frame whereby the plate is movable in linear manner relative to the frame and the wheel is displaceable in linear manner relative to the plate.
  • a rotational translating movement is understood to mean a rotating movement of the wheel round an axis lying perpendicularly of the wheel and intersecting a plane through the wheel at a distance from the centre of the wheel.
  • the wheel herein does not rotate relative to the centre of the wheel, i.e. the orientation of the wheel does not change during the rotational translating movement.
  • the invention provides a transmission which can be manufactured much more advantageously.
  • a preferred embodiment of the invention also provides a mechanical transmission of the above type, wherein the transmission comprises adjusting means for adjusting the eccentricity of the wheel connected to the second shaft relative to the first shaft, which adjusting means are formed by a rotatable and fixable eccentric.
  • the transmission comprises adjusting means for adjusting the eccentricity of the wheel connected to the second shaft relative to the first shaft, which adjusting means are formed by a rotatable and fixable eccentric.
  • Another preferred embodiment of the invention provides a mechanical transmission of the above type wherein the friction wheels are supported externally by nuts, which nuts are provided with contact surfaces which co act with contra-contact surfaces arranged close to the external edge of the friction wheels.
  • the contact surfaces and contra contact surfaces preferably form parts of a helix.
  • the nuts are placed under a bias in a direction toward each other, whereby the annular element can be clamped with a predetermined force between the friction wheels, whereby as the couple increases the pressure between the annular element and the friction wheels increases.
  • the pressure with which the annular element is clamped between the friction wheels depends on the applied couple. Supporting of the friction wheels close to the outer end has the advantage that the con verging form of the mutually facing sides of the friction wheels will not change when extremely great forces are exerted on the friction wheels.
  • Still another embodiment of the invention provides a mechanical transmission of the above type wherein the wheel makes internal contact with the annular element, whereby a radially inward facing surface forms a surface for coaction with the wheel.
  • Fig. 1 shows a mechanical transmission 1 in which a first rotatable shaft 7, being the output shaft, is coupled to a pair of friction wheels 3,4.
  • the output shaft 7 of mechanical transmission 1 is formed by the drum or hub 7.
  • mechanical transmission 1 thus takes a very compact form.
  • a fixed friction wheel 8 Placed between friction wheels 3,4 is a fixed friction wheel 8 which on the inside engages on an endless belt 10 built up of separate links 14. These links 14 are only under strain of pressure whereby a mutual connection of links 14 is unnecessary.
  • the side surfaces 11 of endless belt 10 co-act with the contact side 5,6 of friction wheels 3,4.
  • a bearing bush 84 is connected to wheel 8.
  • the bearing bush 84 is provided with guide elements 73, in this figure cam rollers, which co act with linear guides 71,72 as shown in fig. 2.
  • linear guides 71,72 are also arranged perpendicularly of the first guides 71.
  • Linear guides 71,72 both also lie perpendicular to a second shaft 2 being the input shaft and carrying the wheel 8.
  • Plate 85 is linearly displaceable along the stationary cam rollers 74 in that these latter are movable in the linear guide 72.
  • adjusting means 75 For adjustment of the eccentric position of wheel 8 are provided a rotatable eccentric 76.
  • This rotatable eccentric 76 is also shown in detail in fig. 3.
  • eccentric 76 Arranged in eccentric 76 is a groove 86 which co-acts with a protruding cam 87, which cam 87 is mounted on an adjusting pin 88. Through axial displacement of adjusting pin 88 the cam 87 will also displace and the eccentric will thus rotate, whereby the eccentric position of wheel 8 is changed.
  • Adjusting pin 88 is movable in the hollow shaft 2 which is shown in fig. 4.
  • the bearing bush 84 on which wheel 8 is mounted is shown in detail in fig. 5.
  • Fig. 6 shows a friction wheel 3 in three different views, wherein on the axially external side of friction wheel 3 are shown contact surfaces 89 which co-act with contra-contact surfaces 90 forming part of a nut 91 as shown in fig. 7.
  • Nut 91 is placed on the side of friction wheel 3 remote from the other friction wheel 4 in order to support this friction wheel 3.
  • the contra-contact surfaces 90 herein lie against the contact surfaces 89 of friction wheel 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Friction Gearing (AREA)
  • Gears, Cams (AREA)
  • Retarders (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission Devices (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

PCT No. PCT/NL97/00632 Sec. 371 Date Dec. 1, 1998 Sec. 102(e) Date Dec. 1, 1998 PCT Filed Nov. 19, 1997 PCT Pub. No. WO98/22729 PCT Pub. Date May 28, 1998The invention relates to a mechanical transmission, which transmission includes guide members for realizing a rotational translating movement of a wheel which is connected to an output shaft and which makes contact with an endless belt of mutually abutting push links, which guide members are assembled from at least two linear guide tracks received mutually perpendicularly in the same plate and guide elements co-acting with the linear guide tracks, wherein guide elements are connected to the wheel for rotational translation and guide elements are rigidly connected to the frame whereby the plate is movable in linear manner relative to the frame and the wheel is displaceable in linear manner relative to the plate.

Description

The invention relates to a mechanical transmission comprising a frame, a first shaft which is rotatably connected to the frame and to which is fixed a pair of friction wheels placed at a mutual distance, a second shaft which is connected to the frame for rotation parallel to the first shaft and which carries a wheel which co-acts with an annular element comprising a circular contact surface located axially between the friction wheels of the first shaft, wherein the friction wheels comprise mutually converging friction surfaces.
Such a mechanical transmission is described in European patent EP 0 688 407 A in the name of the same applicant as for the present invention.
The present invention has for its object to provide improvements and additions to a construction of the type described in the preamble. The invention provides for this purpose a transmission of the type stated in the preamble wherein the the transmission comprises guide means for realizing a rotational translating movement of the wheel which is connected to the second shaft, which guide means are assembled from at least two linear guide tracks received mutually perpendicularly in a plate and guide elements co-acting with the linear guide tracks, wherein guide elements are connected to the wheel for rotational translation and guide elements are rigidly connected to the frame whereby the plate is movable in linear manner relative to the frame and the wheel is displaceable in linear manner relative to the plate.
It is known to use a planetary or differential system, such as for instance a plurality of planetary wheels for driving by a sun wheel and having an eccentric cam fixed to the wheel for rotational translation. A rotational translating movement is understood to mean a rotating movement of the wheel round an axis lying perpendicularly of the wheel and intersecting a plane through the wheel at a distance from the centre of the wheel. The wheel herein does not rotate relative to the centre of the wheel, i.e. the orientation of the wheel does not change during the rotational translating movement. The invention provides a transmission which can be manufactured much more advantageously.
A preferred embodiment of the invention also provides a mechanical transmission of the above type, wherein the transmission comprises adjusting means for adjusting the eccentricity of the wheel connected to the second shaft relative to the first shaft, which adjusting means are formed by a rotatable and fixable eccentric. Such an eccentric which is simple to adjust enables variation in simple manner of the transmission ratio in a range which in principle is infinite, wherein it is also possible to cause the first shaft to stand still or to rotate in a direction opposed to that of the second shaft.
Another preferred embodiment of the invention provides a mechanical transmission of the above type wherein the friction wheels are supported externally by nuts, which nuts are provided with contact surfaces which co act with contra-contact surfaces arranged close to the external edge of the friction wheels. The contact surfaces and contra contact surfaces preferably form parts of a helix. Even more preferably the nuts are placed under a bias in a direction toward each other, whereby the annular element can be clamped with a predetermined force between the friction wheels, whereby as the couple increases the pressure between the annular element and the friction wheels increases. In other words: the pressure with which the annular element is clamped between the friction wheels depends on the applied couple. Supporting of the friction wheels close to the outer end has the advantage that the con verging form of the mutually facing sides of the friction wheels will not change when extremely great forces are exerted on the friction wheels.
Still another embodiment of the invention provides a mechanical transmission of the above type wherein the wheel makes internal contact with the annular element, whereby a radially inward facing surface forms a surface for coaction with the wheel. Using this "mirror-symmetrical" construction a very compact transmission can be realized which can for instance be built into a hub. Particularly envisaged herein are the hubs of cycles, but many other applications are of course also conceivable.
The present invention will be further elucidated with reference to the non-limitative embodiments shown in the following figures. Herein:
  • Fig. 1 shows a cross-section of a compactly embodied transmission according to the invention,
  • Fig. 2 shows a cross-section along the line II-II of the transmission shown in fig. 1.
  • Fig. 3 shows three views of an adjusting bush which forms part of the adjusting means for adjusting the eccentricity of the second shaft,
  • Fig. 4 shows three views of an adjusting pin for receiving in the adjusting bush of fig. 3,
  • Fig. 5 shows two views of a bearing bush which forms part of the transmission shown in fig. 1,
  • Fig. 6 shows three views of a friction wheel according to the invention, and
  • Fig. 7 shows two views of a nut for co-action with the friction wheel shown in fig. 6.
    • Fig. 1 shows a mechanical transmission 1 in which a first rotatable shaft 7, being the output shaft, is coupled to a pair of friction wheels 3,4. The output shaft 7 of mechanical transmission 1 is formed by the drum or hub 7. mechanical transmission 1 thus takes a very compact form. Placed between friction wheels 3,4 is a fixed friction wheel 8 which on the inside engages on an endless belt 10 built up of separate links 14. These links 14 are only under strain of pressure whereby a mutual connection of links 14 is unnecessary. The side surfaces 11 of endless belt 10 co-act with the contact side 5,6 of friction wheels 3,4. A bearing bush 84 is connected to wheel 8. In order to effect a rotational translating movement of wheel 8, the bearing bush 84 is provided with guide elements 73, in this figure cam rollers, which co act with linear guides 71,72 as shown in fig. 2. In a plate 85 in which are arranged linear guides 71, linear guides 72 are also arranged perpendicularly of the first guides 71. Linear guides 71,72 both also lie perpendicular to a second shaft 2 being the input shaft and carrying the wheel 8. Plate 85 is linearly displaceable along the stationary cam rollers 74 in that these latter are movable in the linear guide 72.
    For adjustment of the eccentric position of wheel 8 are provided adjusting means 75 in which is received a rotatable eccentric 76. This rotatable eccentric 76 is also shown in detail in fig. 3. Arranged in eccentric 76 is a groove 86 which co-acts with a protruding cam 87, which cam 87 is mounted on an adjusting pin 88. Through axial displacement of adjusting pin 88 the cam 87 will also displace and the eccentric will thus rotate, whereby the eccentric position of wheel 8 is changed. Adjusting pin 88 is movable in the hollow shaft 2 which is shown in fig. 4. The bearing bush 84 on which wheel 8 is mounted is shown in detail in fig. 5.
    Fig. 6 shows a friction wheel 3 in three different views, wherein on the axially external side of friction wheel 3 are shown contact surfaces 89 which co-act with contra-contact surfaces 90 forming part of a nut 91 as shown in fig. 7. Nut 91 is placed on the side of friction wheel 3 remote from the other friction wheel 4 in order to support this friction wheel 3. The contra-contact surfaces 90 herein lie against the contact surfaces 89 of friction wheel 3.

    Claims (6)

    1. Mechanical transmission (1) comprising a frame, a first shaft (7) which is rotatably connected to the frame and to which is fixed a pair of friction wheels (3,4) placed at a mutual distance, a second shaft (2) which is connected to the frame for rotation parallel to the first shaft (7) and which carries a wheel (8) which co-acts with an annular element comprising a circular contact surface (11) located axially between the friction wheels (3,4) of the first shaft (7), wherein the friction wheels (3,4) comprise mutually converging friction surfaces (5,6),
         characterized in that
         the transmission (1) comprises guide means for realizing a rotational translating movement of the wheel (8) which is connected to the second shaft (2), which guide means are assembled from at least two linear guide tracks (71,72) received mutually perpendicularly in a plate (85) and guide elements (73,74) co-acting with the linear guide tracks (71,72), wherein guide elements (73) are connected to the wheel (8) for rotational translation and guide elements (74) are rigidly connected to the frame whereby the plate (85) is movable in linear manner relative to the frame and the wheel (8) is displaceable in linear manner relative to the plate (85).
    2. Mechanical transmission (1) according to claim 1,
         characterized in that
         the transmission (1) comprises adjusting means (75) for adjusting the eccentricity of the wheel (8) connected to the second shaft (2) relative to the first shaft (7), which adjusting means (75) are formed by a rotatable and fixable eccentric (76).
    3. Mechanical transmission (1) according to claim 1 or 2,
         characterized in that
         the friction wheels (3,4) are supported externally by nuts (91), which nuts (91) are provided with contra-contact surfaces (90) which co-act with contact surfaces (89) arranged close to the external edge of the friction wheels (3,4).
    4. Mechanical transmission as claimed in claim 3,
         characterized in that
         the contact surfaces (89) and the contracontact surfaces (90) form parts of a helix.
    5. Mechanical transmission (1) according to one of the preceding claims,
         characterized in that
         the wheel (8) makes contact with the annular element, whereby a radially inward facing surface forms a surface (9) for co-action with the wheel (8).
    6. Mechanical transmission as claimed in one of the preceding claims,
         characterized in that
         the annular element consists of an endless belt (10) of mutually abutting push links (14).
    EP97913538A 1996-11-21 1997-11-19 Mechanical gearing Expired - Lifetime EP0876561B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    NL1004589 1996-11-21
    NL1004589A NL1004589C2 (en) 1996-11-21 1996-11-21 Improved mechanical transmission.
    PCT/NL1997/000632 WO1998022729A1 (en) 1996-11-21 1997-11-19 Mechanical gearing

    Publications (2)

    Publication Number Publication Date
    EP0876561A1 EP0876561A1 (en) 1998-11-11
    EP0876561B1 true EP0876561B1 (en) 2002-09-11

    Family

    ID=19763918

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97913538A Expired - Lifetime EP0876561B1 (en) 1996-11-21 1997-11-19 Mechanical gearing

    Country Status (9)

    Country Link
    US (1) US6117044A (en)
    EP (1) EP0876561B1 (en)
    AT (1) ATE224020T1 (en)
    DE (1) DE69715373T2 (en)
    DK (1) DK0876561T3 (en)
    ES (1) ES2183153T3 (en)
    NL (1) NL1004589C2 (en)
    PT (1) PT876561E (en)
    WO (1) WO1998022729A1 (en)

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102004028484A1 (en) * 2004-06-11 2005-12-29 Ina-Schaeffler Kg friction wheel drive
    US12359708B2 (en) * 2021-06-28 2025-07-15 Sri International Transmission with radially inverted pulleys

    Family Cites Families (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US1574620A (en) * 1925-03-16 1926-02-23 Autodrive Company Differential transmission mechanism
    US2024459A (en) * 1933-07-27 1935-12-17 Chrysler Corp Driving mechanism
    US2686432A (en) * 1949-10-28 1954-08-17 Walter E Gudert Mechanical infinitely variable speed transmission
    US2687650A (en) * 1951-04-23 1954-08-31 Terrot Ets Variable speed control device
    US3082634A (en) * 1959-10-29 1963-03-26 Battistin Ferdinando Variable-speed drives
    US3324746A (en) * 1963-04-26 1967-06-13 Kari Veikko Leonard Steplessly controlled differential reducer coupling
    US4924730A (en) * 1987-08-25 1990-05-15 Jaguar Cars Limited Transmission systems
    NL9300492A (en) * 1993-03-19 1994-10-17 Heerke Hoogenberg Mechanical transmission.

    Also Published As

    Publication number Publication date
    ATE224020T1 (en) 2002-09-15
    DE69715373T2 (en) 2003-04-30
    US6117044A (en) 2000-09-12
    NL1004589A1 (en) 1998-05-27
    WO1998022729A1 (en) 1998-05-28
    PT876561E (en) 2003-01-31
    NL1004589C2 (en) 1998-08-26
    DK0876561T3 (en) 2002-12-02
    DE69715373D1 (en) 2002-10-17
    ES2183153T3 (en) 2003-03-16
    EP0876561A1 (en) 1998-11-11

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